22Oct2015: H-alpha Prominence Study

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p_zetner
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22Oct2015: H-alpha Prominence Study

Post by p_zetner » Thu Nov 12, 2015 8:15 pm

Greetings Everyone.

Observing with the SHG allowed me to study some of the spectral characteristics of the large quiescent prom visible on the E Limb (22Oct.). I'm presenting a spectral series of the prom imaged in H-alpha as well as dopplergrams at three different velocities. The dopplergrams were made by subtracting a prom image made at a specific blue offset (with respect to line centre) from an image made with the same offset to the red side. Offsets were converted into velocities with the Doppler formula: delta_lambda / lambda = v/c with lambda=6562.8 Angstroms. Red (blue) patches in the dopplergrams show gas streaming with the indicated velocity of recession (approach). Even a quiescent prominence has, apparently, a pretty complex structure in velocity!

Hope you enjoy.
Peter.
Montage_112157-p0_lbls.png
Montage_112157-p1_colour_lbls.png
Last edited by p_zetner on Fri Nov 13, 2015 2:20 pm, edited 1 time in total.

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Carbon60
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Re: 22Oct2015: H-alpha Prominence Study

Post by Carbon60 » Thu Nov 12, 2015 8:44 pm

Great science, Peter. Interesting dynamics going on there.

Nicely done!

Stu.
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Re: 22Oct2015: H-alpha Prominence Study

Post by Montana » Fri Nov 13, 2015 10:22 am

Superb work :bow :bow :hamster: I was trying to do this but was limited to blue wing and centre line only, this gives far better dynamics.

Alexandra

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Re: 22Oct2015: H-alpha Prominence Study

Post by Derek Klepp » Fri Nov 13, 2015 10:32 am

Thanks Peter

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p_zetner
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Re: 22Oct2015: H-alpha Prominence Study

Post by p_zetner » Fri Nov 13, 2015 2:04 pm

Thanks Stu, Alexandra and Derek.

Analyzing the data from any given SHG observing session can be a long process! There's always a lot of information to be had.

By the way, I've edited the original post of the dopplergrams image. The colour was backwards! I was wondering why it was really hard for me to visualize the velocities. The proper colour scheme makes it easier for me to understand. There seems to be a foreground component of the big, hedgerow prominence which streams toward us and a background component which recedes.

Cheers.
Peter.

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Re: 22Oct2015: H-alpha Prominence Study

Post by marktownley » Sat Nov 14, 2015 8:54 am

An excellent study there Peter!
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Re: 22Oct2015: H-alpha Prominence Study

Post by p_zetner » Sun Nov 15, 2015 5:15 am

Thanks, Mark.

Here's a re-work of the velocity study where I consolidate the dopplergram information with an image of the prominences.
Here's the prominence image (the effective bandwidth used for the generation of this image is about 0.25A):
112157-00-10px_ARL7x7_sz_fft-v_flat-cor_proc_doppler_ctr-crop.png
112157-00-10px_ARL7x7_sz_fft-v_flat-cor_proc_doppler_ctr-crop.png (157.46 KiB) Viewed 880 times
Here's a velocity map image with the dopplergram information introduced into the colour channel of the above prominence image. All three images are the same prominences coloured with the dopplergrams corresponding to 21 km/s, 14 km/s and 7 km/s.
112157-00-10px_ARL7x7_sz_fft-v_flat-cor_proc_doppler_proc2_lbls.png
I think the result is a bit more aesthetic than the dopplergrams alone.

Cheers.
Peter.

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